Filament sensor stuck?
I was in the middle of a print and ran out of filament. Mk4S detected and notified me. I had some trouble getting the filament out, so machine advised me to unlock the side door and pull it out. I did and removed the filament. However, the screen is stuck saying "Please remove filament from the filament sensor". I am unable to leave that screen and there seems to be nothing in the hole. I had to abort the print and then I was able to load filament normally. Is there an error in the filament sub-routine?
RE: Filament sensor stuck?
https://help.prusa3d.com/article/filament-sensor-mk4-mk3-9-xl_465702
RE: Filament sensor stuck?
Thank you for the link, but it is for the Mk4, not the Mk4S. I don't think it was dirty, as it was visibly clear, only the third print on new hardware, and occurred only during the out-of-filament event. The sensor worked just fine after reset.
RE:
The Nextruder is the same on both so the instructions are the same. The area that this clears out you cannot visually see unless you disassembled the area where the spring loaded ball is.
I don't think a subroutine error is likely as I've changed filament many times mid print without issue, but maybe a certain order of steps caused it to happen.
Glad it's fixed. I've had the same issue on time before in the middle of the print and the compressed air worked.
RE: Filament sensor stuck?
I had the same issue - the printer ran out of filament mid-print, it asked me if the filament unloaded successfully, I confirmed it and then the screen got stuck saying "Please remove filament from the filament sensor". Had to abort the print, load filament and start the print from scratch.
RE: Filament sensor stuck?
same issue as there people. Sadly no fix yet. Seems a software but if reboot fixes it…
RE:
same issue as there people. Sadly no fix yet. Seems a software but if reboot fixes it…
Next time try jiggling filament in and out of the extruder, and if that doesn't work how air in the hole on top of the Nextruder. This has happened to me 1x and blowing air in the hole fixed the issue and I was able to resume the print. I think a very small amount of debris can case the ball to not move all the way causing the issue. Restarting they other may work because it likely resets the status of the sensor.
RE: Filament sensor stuck?
Just lost a print to this on the MK4S. Compressed air didn't help, and I messed up the "power loss" trick. Had to restart two more times and load new filament to print again.
The next time I ran out, I had to jam new filament into the running print head, because the printer didn't even stop.
RE: Filament sensor stuck?
Just lost a print to this on the MK4S. Compressed air didn't help, and I messed up the "power loss" trick. Had to restart two more times and load new filament to print again.
The next time I ran out, I had to jam new filament into the running print head, because the printer didn't even stop.
Sounds like the sensor was stuck to me. Where did you blow air, and what did you use for the air?
RE: Filament sensor stuck?
Next time try jiggling filament in and out of the extruder, and if that doesn't work how air in the hole on top of the Nextruder. This has happened to me 1x and blowing air in the hole fixed the issue and I was able to resume the print. I think a very small amount of debris can case the ball to not move all the way causing the issue. Restarting they other may work because it likely resets the status of the sensor.
You saved my print, thank you! I've only had this issue when I remove the filament before it prompts and I've always had to restart, but this was a complicated color-change job and I had used all of the first color so I couldn't start over again. Blowing air in and jiggling the filament worked!
RE:
After the extruder rejects the filament, the filament stays in extruder pushing on the FS ball which pushes the magnet behind the ball and the magnet influences the HAL sensor. The FW monitors the FS status i.e the magnet position. The request "Please remove filament from filament sensor" expects you to pull out the rest of the filament. This action let the spring push the magnet from the HAL sensor, which triggers the FS and the printer recognises it is free of the filament. So, it requires physical action instead of pressing the knob. The it asks you to insert the new one. The inserted filament pushes again on the FS ball attached to the magnet. The magnet movement triggers the hall senzor and the FW starts rotating the extruder motor. That´s it.
I had the same issue - the printer ran out of filament mid-print, it asked me if the filament unloaded successfully, I confirmed it and then the screen got stuck saying "Please remove filament from the filament sensor". Had to abort the print, load filament and start the print from scratch.
